Getting back into lol with... Riven

I'm bronze V- IV and suck mechanically although for a bronze, my decisions are decent due to playing lots of jg and crushing because that's what jg requires but not mid or high elo worthy. Let's be honest here. Im bronze. I actually admit I suck. I've been doing that for a while. I stopped playing a month ago due to computer malfunctions bit I got a backup fixed for now until I can fix the main computer. I heard riven can reach you a bit about the game. There are pros who started as riven mains. Also I think I can try to improve. I need better cs, champion mechanics, more advanced practces, etc. Don't yet deserve silver or gold. I want that shit but I need proof that I deserve it. This isn't a case of the lol stereotype salty as Tyler1 in the dead Sea riven main. I have tried her a couple times when free and I'm OK but no box box. Never legit practiced with her. I know what happens when I try to do the master. I fail. But riven, I'm not so bad but need to get good with her before ranked. That's why I'm willing to do 50 normals as riven. I play Pantheon who is also a simular play style but with map controll. So should I attempt to get better at the game and return through riven or should I stick to simple shit like normal.